The duet's exquisite respect for pauses and entries was especially impressive.

The evening finished with a slapstick performance of Offenbach's Doll Song.

Jo's stage persona inclines more towards the coquettish and humorous than the tragic. There is something inherently amusing in watching a singer whose control is so complete she can simply toy with it.

And when she can also soar, as if in flight, the effect can be bewitching.